NetGuard Marcel Bokhorst

NetGuard is a simple way to block
access to the internet – no root required.
Applications can individually be allowed or denied access to
your WiFi and/or mobile connection.
Blocking access to the internet can help:
– reduce your data usage
– save your battery
– increase your privacy
Features:
– No root required
– Simple to use
– Free of charge
– Open source
– No extra battery usage
– No calling home
– No tracking or analytics
– No ads
– IPv4/IPv6 TCP/UDP supported
– Block system and user applications
NetGuard does not even require the internet permission.
NetGuard is possibly the first free and open source no-root
firewall for Android.
Most of these features are the result of sending selected
traffic to a sinkhole, instead of filtering all internet
traffic.
This means that advanced features, like address based filtering
(needed for hosts blocking), traffic logging, and on-demand
configuration, are not possible.
For up to date info on device compatibility, questions and
answers please read more here: http://forum.xda-developers.com/showthread.php?t=3233012